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ELECTRIC CABLE.

No. 452,342. Patented May 12, 1891.

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Att y UNITED STATES PATENT OFFICE.

VILLIAM A. OONNER, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO THE STANDARDUNDERGROUND CABLE COMPANY, OF SAME PLACE.

ELECTRIC CABLE.

SPECIFICATICN forming part of Letters Patent No. 452,342, dated May 12,1891.

Application tiled July 24,1890. Serial No. 359,717. (No model.)

To @ZZ whom it may concern.-

Be it known that I, VILLIAM A. OONNER, a citizen of the United States,residing at Pittsburg, in the county of Allegheny and State ofPennsylvania, have inventedor discovered certain new andusefulImprovements in Electric Cables, of which improvements thefollowing is a specification.

In applications of even date herewith I have described and claimedcertain improvements in electric cables, the inventions A therein setforth having for their object the production of cables of low staticcapacity and especially designed for telephone service.

This invention relates to certain f u rtherimprovements in that class orkind of cables,

and is hereinafter more fully described and claimed.

In the accompanying drawings, forming a part of this specification,Figure 1 is a sectional elevation of a cable, showing the manner ofpreparing the wires and core, and Fig. 2 is in sectional elevationaportion of a cable constructed in accordance with myinvention.

In the practice' of my invention the conductors or wires l are covered,either by braiding or wrapping to any desired thickness, with cotton,jute, hemp, paper, or other suitable material, preferably of a fibrousnature. This covering 2 is preferably applied in such aloose manner thatinterstices or openings will be formed therein; but, if desired, thematerial may be so applied as to form a close compact covering. Thecovered wires in any desired number are then laid up in any suitablemanner and inclosed by a wrapping 3 of cotton tape, paper, or othersuitable material. This wrapping is applied in such manner as willprevent, except as hereinafter described, the penetration 0f the sealingmaterial into the covering 2 of the wires. The core thus prepared ispassed through the hollow core-bar of a lead-press for the applicationof the lead sheath at. The core-bar is filled with a suitable sealing`material, as paraftine, resin, oil, rubber compounds, dic., andprovision is made whereby a suflicient pressure maybe applied whendesired to the sealing material to cause it to penetrate through thewrapping 3 of the core and also the coverings 2 of the wires and fillthe interstices in such covering and between the wires. The press isthen so adjusted that when set in operation the lead will bepressedvtightly around the core, compressing the wires closely together,and at the same time pressure is applied to the sealing material, so asto causeit to pass through the wrapping 3 and thoroughly impregnato thecore. After three or four feet (more or less) of the core have been thussaturated and compressed the press is readjusted, so as to apply thelead sheath loosely around the core, and the sealing material relievedfrompressure to a sufcient extent that itwill not be forced through thewrapping 3. It is preferred, however, to maintain a slight pressure onthe sealing material at all times, so as to insure its entrance betweenthelead sheath and the wrapping 3, as shown at G. After about forty oriifty feet (more or less) of the core has passed through the press thelatter is again adjusted to force the lead tightly around the core andthe pressure increased on the sealing material to cause it to againimpregnate the core for a distance of two or three feet, (more or less,)when the press is again changed and the pressure on the sealing materialreduced, as before stated. These seals 5, which will prevent the escapeof air from the core and the entrance of moisture thereinto, are formedat both ends of the cable-section and also at intermediate points, sothat the entire cable will not be destroyed or injured through a ruptureat one or two points.

I claim herein as my invention- 1. In an electric cable, the combinationof a series of two or more wires covered with fibrous material, awrapping of closely-laid material inclosing said wires into a core, acoating of sealing material covering said wrapping, the sealing materialimpregnating and filling the interstices in the core at suitableintervals, and a lead sheath, said sheath tightly compressing the coreat points where it is iilled with sealingmaterial,substantially as setforth.

2. As an improvement in the art of manufacturin g electric cables, themethod described herein, consisting in covering each wire with iibrousmaterial, inclosing a series of two or more wires so covered in a coreby a closelylaid Wrapping, applying sealing material to l In testimonywhereof l have hereunto set said w1apping,eausing the sealing materialmy hand. to pass through the wrapping and fill the core at suitableintervals, covering the eore with a i 5 lead sheath, and compressing'the sheath I Vituesses:

against the core Where the same is lled with the sealing material,substantially as set forth.

VILLIAM A. CONNER.

W. B. CORWIN, DARWIN S. WoLooT'r.

